LG Multiplex 72 Service Manual
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LG Multiplex 72 Service Manual

LG Multiplex 72 Service Manual

Triple combi tv
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Triple Combi TV

SERVICE MANUAL

CHASSIS : MV-033A
MODEL : Multiplex 72
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
OPEN/
STOP
PLAY
CLOSE
ON/OFF
DVD
TRK
COPY
VCR
REC
PM
TV
e-mail:http://www.LGEservice.com/techsup.html
STOP/
PLAY
REC/ITR
EJECT
website:http://biz.LGservice.com

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Summary of Contents for LG Multiplex 72

  • Page 1: Service Manual

    Triple Combi TV SERVICE MANUAL CHASSIS : MV-033A MODEL : Multiplex 72 CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. OPEN/ STOP/ PLAY REC/ITR STOP PLAY CLOSE EJECT ON/OFF COPY...
  • Page 2 SECTION 1 SUMMARY Triple Combi TV SERVICE MANUAL CONTENT SAFETY INSTRUCTIONS ......1-2 SERVICING PRECAUTIONS ....... 1-4 SPECIFICATION ..........1-5 OPEN/ STOP/ PLAY REC/ITR DESCRIPTION OF CONTROLS ....1-8 ON/OFF STOP PLAY CLOSE EJECT COPY CHASSIS : MV-033A MODEL : Multiplex 72...

  • Page 3: Description Of Controls

    11. ARC (Aspect Ratio Control) changes the picture format. 12. TVCR / DVD selects to control a LG video cassette recorder or DVD player. 13. EJECT Open or close the disc tray. ejects the tape.
  • Page 4 16. TV/AV selects the remote operating mode. clears the menu from the screen. switches the set on from standby. 17. TELETEXT BUTTONS (option) These buttons are used for teletext. For further details, see the ‘Teletext’ section. 18. LIST displays the programme table. 19.

  • Page 5: Front Panel

    Front panel Shown is a simplified representation of front or side panel. Here shown may be somewhat different from your set. Multiplex 72 series OPEN/ STOP PLAY CLOSE STOP/ EJECT PLAY REC/ITR ON/OFF COPY OPEN/ STOP/ PLAY REC/ITR STOP PLAY...

  • Page 6: Adjustment Instructions

    2.6. Signal 3.2.2. CTL ADJUSTMENT Receive the standard color signal. (65dB ! 1dB uV) THIS ADJUSTMENT MUST BE DONE WHEN THE LG standard signal means the digital pattern PAL-B/G UNCONTROLLED DECK IS WAREHOUSED. 05CH. 1) Connect the OSCILLOSCOPE to J101(CTL) 3.
  • Page 7 DVCO adjustment,) 3.3.2. ADJUSTMENT PREPARATION 4.2. FOCUS ADJUSTMENT 1).Connect oscilloscope(CH-1) to J261(H/SW) on main PCB. 1). Receive the LG standard pattern(digital pattern, Fig5). (Use for trigger of CH-2 ) 2) Connect oscilloscope(CH-2) to J261(RF) on main PCB. (Use waveform of CH-2) 3) Play by inserting SP PAL TAPE.
  • Page 8 2) Adjustment 5) Adjust LOW Light status of CUT R CUT B at CUT B. ¤ Converge the RED vertical line and BLUE vertical line 6) Repeat 1) ~ 5) until both low and high light have same the same line by changing the angle between the 2 tab color temperature.
  • Page 9 5. SVC Dat & PSM,SSM Setting Data Picture Setting Data (LINE SVC-3) : No need of adjustment <Table 5> 21” 29” OPTION CONTENTS RANGE FLAT FLAT DVCO Digital VCO -2048~2047 00A1 BCLTH BCL TRERHOLD 0~2047 00FB NTSC <Fig.6> BCLTM BCL TIME 0~15 00D0 BCLGN...
  • Page 10 6. Option Adjustment 6.2.3. OPTION-2 Function OPTION CODE FUNCTION REMARK 6.1. Preparation for Adjustment TSS (Turbo WITHOUT TURBO SEARCH 1) This decides function in accordance with model. Press the SVC TX adjustment button (IN-START button) at search) WITH TURBO SEARCH SVC model, then adjust the option at OPTION 1, 2, 3 mode.

  • Page 11: Block Diagram

    BLOCK DIAGRAM...

  • Page 14: Troubleshooting

    TROUBLE SHOOTING NO Play Of VCR, DVD No Play Of VCR No Play Of DVD Chec k t he vo lt ag e Op en/ Clo se Co nt ro l ? o f P03 p in2, 4 12V &13. 5V Bad Disc , No Disc Chec k The VCR On t he Menu...
  • Page 15 NO Rast er : No Mo nit o r o n Chec k AC Po wer at P801 Op en Chec k Is t he vo lt ag e at D824 RL701( Relay) ( B+ ) ? Chec k / rep lac e Chec k t he in/ o ut RL701 o f IC801...
  • Page 16 NO So und / Pic t ure OK Selec t c o rrec t syst em in MENU Chec k t he w avef o rm o f PIN 4, 12 IC851 Chec kVc c / rep lac e IC851 Chec k t he w avef o rm o f PIN 27, 28 IC601 Chec k / rep lac e...
  • Page 17 NO Pic ture / SOUND OK Chec k t he Wavef o rm o f IC501 Pin42, 43, 44 No t OK Chec k VCC o f IC501 Chec k t he Pin 3. 15. 25, 45, 54 Heat er Vo lt 6. 0V~ 6. 4V? 3.
  • Page 18 NO Play Of VCR, DVD No Play Of VCR No Play Of DVD Chec k t he vo lt ag e Op en/ Clo se Co nt ro l ? o f P03 p in2, 4 12V &13. 5V Bad Disc , No Disc Chec k The VCR On t he Menu SMPS Bo ard...
  • Page 19 P/NO: 3854VA0122A - S1(1/2) 2004.2.26...
  • Page 20 P/NO: 3854VA0122A - S1(2/2) 2004.2.26...

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